This math topic focuses on finding the area of a trapezoid using the concept of an equivalent rectangle. Students are presented with various trapezoids and asked to derive an equation representing the area of a rectangle that would be equivalent in area to each trapezoid. Each problem comes with multiple-choice answers, which involve determining the correct multiplication expressions of dimensions that would yield the trapezoid's area. This set of problems challenges students to apply their understanding of shapes, areas, and basic algebra to real-world geometric scenarios.